Dual lamp



FIG. 1 is a front and side perspective view of a dual lamp embodying my new design;

FIG. 2 is a side elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a top plan view thereof; and

FIG. 5 is a bottom view thereof.

The electrical power supply cord and probe are shown in broken lines for illustrative purposes only. 

The ornamental design for a dual lamp, as shown and described. 